public abstract class AbstractSelectClause extends AbstractExpression
The DISTINCT keyword is used to specify that duplicate values must be eliminated from the query result. If DISTINCT is not specified, duplicate values are not eliminated. Stand-alone identification variables in the SELECT clause may optionally be qualified by the OBJECT operator. The SELECT clause must not use the OBJECT operator to qualify path expressions.
SelectClause,
SimpleSelectClauseCOMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCOREABS, ALL, AND, ANY, AS, AS_OF, ASC, AVG, BETWEEN, BIT_LENGTH, BOTH, CASE, CAST, CHAR_LENGTH, CHARACTER_LENGTH, CLASS, COALESCE, COLUMN, CONCAT, CONNECT_BY, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DELETE, DELETE_FROM, DESC, DIFFERENT, DISTINCT, DIVISION, ELSE, EMPTY, END, ENTRY, EQUAL, ESCAPE, EXCEPT, EXISTS, EXTRACT, FALSE, FETCH, FIRST, FROM, FUNC, FUNCTION, GREATER_THAN, GREATER_THAN_OR_EQUAL, GROUP_BY, HAVING, IN, INDEX, INNER, INNER_JOIN, INNER_JOIN_FETCH, INTERSECT, IS, IS_EMPTY, IS_NOT_EMPTY, IS_NOT_NULL, IS_NULL, JOIN, JOIN_FETCH, KEY, LAST, LEADING, LEFT, LEFT_JOIN, LEFT_JOIN_FETCH, LEFT_OUTER_JOIN, LEFT_OUTER_JOIN_FETCH, LENGTH, LIKE, LOCATE, LOWER, LOWER_THAN, LOWER_THAN_OR_EQUAL, MAX, MEMBER, MEMBER_OF, MIN, MINUS, MOD, MULTIPLICATION, NAMED_PARAMETER, NEW, NOT, NOT_BETWEEN, NOT_EQUAL, NOT_EXISTS, NOT_IN, NOT_LIKE, NOT_MEMBER, NOT_MEMBER_OF, NULL, NULLIF, NULLS, NULLS_FIRST, NULLS_LAST, OBJECT, OF, ON, OPERATOR, OR, ORDER_BY, ORDER_SIBLINGS_BY, OUTER, PLUS, POSITION, POSITIONAL_PARAMETER, QUOTE, REGEXP, SCN, SELECT, SET, SIZE, SOME, SQL, SQRT, START_WITH, SUBSTRING, SUM, TABLE, THEN, TIMESTAMP, TRAILING, TREAT, TRIM, TRUE, TYPE, UNION, UNKNOWN, UPDATE, UPPER, VALUE, WHEN, WHERE| Modifier | Constructor and Description |
|---|---|
protected |
AbstractSelectClause(AbstractExpression parent)
Creates a new
SelectClause. |
| Modifier and Type | Method and Description |
|---|---|
void |
acceptChildren(ExpressionVisitor visitor)
Visits the children of this
Expression. |
protected void |
addChildrenTo(java.util.Collection<Expression> children)
Adds the children of this
AbstractExpression to the given collection. |
protected void |
addOrderedChildrenTo(java.util.List<Expression> children)
Adds the children of this
AbstractExpression to the given list. |
CollectionExpression |
buildCollectionExpression()
Creates a new
CollectionExpression that will wrap the single select item. |
JPQLQueryBNF |
findQueryBNF(Expression expression)
Retrieves the
JPQLQueryBNF that represents the fragment of this Expression
that was used when parsing the given Expression. |
java.lang.String |
getActualDistinctIdentifier()
Returns the actual DISTINCT identifier found in the string representation of the JPQL
query, which has the actual case that was used.
|
java.lang.String |
getActualIdentifier()
Returns the actual SELECT identifier found in the string representation of the JPQL
query, which has the actual case that was used.
|
Expression |
getSelectExpression()
Returns the
Expression representing the select items. |
abstract java.lang.String |
getSelectItemQueryBNFId()
Returns the unique identifier of the
JPQLQueryBNF for the list of select items to parse. |
boolean |
hasDistinct()
Determines whether the identifier DISTINCT was parsed or not.
|
boolean |
hasSelectExpression()
Determines whether the list of select items was parsed.
|
boolean |
hasSpaceAfterDistinct()
Determines whether a whitespace was parsed after DISTINCT.
|
boolean |
hasSpaceAfterSelect()
Determines whether a whitespace was parsed after SELECT.
|
protected void |
parse(WordParser wordParser,
boolean tolerant)
Parses the query by starting at the current position, which is part of the given
WordParser. |
protected boolean |
shouldSkipLiteral(AbstractExpression expression)
When parsing an invalid or incomplete query, it is possible two literals would be parsed but
in some cases, a CollectionExpression should not be created and the parsing should actually
stop here.
|
protected void |
toParsedText(java.lang.StringBuilder writer,
boolean actual)
Generates a string representation of this
Expression, including its children,
if it has any. |
acceptUnknownVisitor, acceptUnknownVisitor, buildExpressionFromFallingBack, buildNullExpression, buildStringExpression, buildStringExpression, buildUnknownExpression, calculatePosition, children, findFallBackExpressionFactory, getExpressionFactory, getExpressionRegistry, getGrammar, getIdentifierVersion, getJPAVersion, getLength, getOffset, getParent, getQueryBNF, getRoot, getText, handleAggregate, handleCollection, isAncestor, isIdentifier, isNull, isParsingComplete, isTolerant, isUnknown, isVirtual, orderedChildren, parse, parseUsingExpressionFactory, populatePosition, rebuildActualText, rebuildParsedText, setParent, setText, shouldParseWithFactoryFirst, toActualText, toParsedText, toStringclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitaccept, getQueryBNFprotected AbstractSelectClause(AbstractExpression parent)
SelectClause.parent - The parent of this expressionpublic void acceptChildren(ExpressionVisitor visitor)
Expression. This method can be used to optimize traversing
the children since a new list is not created every time Expression.children() is called.
This does not traverse the Expression sub-hierarchy, use a subclass of
AbstractTraverseChildrenVisitor in order to traverse the entire sub-hierarchy.
visitor - The visitor to visit the children of this object.protected void addChildrenTo(java.util.Collection<Expression> children)
AbstractExpression to the given collection.addChildrenTo in class AbstractExpressionchildren - The collection used to store the childrenprotected void addOrderedChildrenTo(java.util.List<Expression> children)
AbstractExpression to the given list.addOrderedChildrenTo in class AbstractExpressionchildren - The list used to store the string representation of this AbstractExpressionpublic CollectionExpression buildCollectionExpression()
CollectionExpression that will wrap the single select item.public JPQLQueryBNF findQueryBNF(Expression expression)
JPQLQueryBNF that represents the fragment of this Expression
that was used when parsing the given Expression.findQueryBNF in interface ExpressionfindQueryBNF in class AbstractExpressionexpression - The Expression that is a descendant of this oneJPQLQueryBNF that was used to parse the given expressionpublic final java.lang.String getActualDistinctIdentifier()
public final java.lang.String getActualIdentifier()
public final Expression getSelectExpression()
Expression representing the select items.public abstract java.lang.String getSelectItemQueryBNFId()
JPQLQueryBNF for the list of select items to parse.public final boolean hasDistinct()
true if the identifier DISTINCT was parsed;
false otherwisepublic final boolean hasSelectExpression()
true the list of select items was parsed;
false otherwisepublic final boolean hasSpaceAfterDistinct()
true if there was a whitespace after DISTINCT;
false otherwisepublic final boolean hasSpaceAfterSelect()
true if there was a whitespace after SELECT;
false otherwiseprotected void parse(WordParser wordParser, boolean tolerant)
WordParser.parse in class AbstractExpressionwordParser - The text to parse based on the current position of the cursortolerant - Determines whether the parsing system should be tolerant, meaning if it should
try to parse invalid or incomplete queriesprotected boolean shouldSkipLiteral(AbstractExpression expression)
shouldSkipLiteral in class AbstractExpressionexpression - The Expression that has just been parsed or nulltrueprotected void toParsedText(java.lang.StringBuilder writer,
boolean actual)
Expression, including its children,
if it has any.toParsedText in class AbstractExpressionwriter - The buffer used to append this Expression's string representationactual - Determines whether the string representation should represent what was parsed,
i.e. include any "virtual" whitespace (such as ending whitespace) and the actual case of the
JPQL identifiers